Well, thanks for the info realchaos. I was hoping for more input from the community but what can you do.
On my own i managed to overclock my Sapphire 7870 XT card quite a bit. My max stable GPU clocks are at 1165 Mhz under 99% load (at 78*C) with "Power control settings" at 15%. It is also stable at 1190Mhz but my temps hit the 80-82*C threshold which im not to comfortable with.
Memory however is a different story all together. I managed to reach 1600 Mhz stable and that was it. I ended up leaving it on 1550 Mhz.